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Linn Owners

Converting LK140 to passive

GarthVader

Newbie
Wammer
Jan 17, 2022
3
0
0
Hi all,

First post from a hi-fi novice...

I was recently gifted an old Linn system consisting of a Kolektor, Ikemi CD player, LK140 bass, LK140 treble and 2 x Keiledh speakers.

Got it all set up and working perfectly. Loved it. Trouble came when I had to move it over Christmas. When I was reconnecting it I blew the bass LK140 (happened while reconnecting the speakers and forgetting to power down the amp - clever/dumb balance restored), and the main PCB is fried. The bass card seems OK.

Linn and a Linn specialist have both said the card is unsalvageable, and the best bet is to either scour eBay for another LK140 (or maybe just the main PCB?) or reconfigure the treble LK140 to run as a single passive amp and [SIZE=11pt]link the Keilidh terminals for single wiring.[/SIZE]

[SIZE=11pt]I'm going down the single passive amp route until I can find a replacement PCB for now, so i[/SIZE]s reconfiguring the treble amp simply a case of disconnecting the Aktiv treble board?

Thanks in advance,
Garth

 

Suffolkboy

Newbie
Wammer
Apr 19, 2020
123
118
48
Hi all,

First post from a hi-fi novice...

[SIZE=11pt]I'm going down the single passive amp route until I can find a replacement PCB for now, so i[/SIZE]s reconfiguring the treble amp simply a case of disconnecting the Aktiv treble board?

Thanks in advance,
Garth
Yes.

 
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heimo

Naimless
Wammer
Sep 14, 2020
53
44
23
Vienna, Austria EU
AKA
Heimo
HiFi Trade?
  1. No
That's the easy part, though. You then need to convert the Keilidhs' built-in crossovers back to passive, otherwise you will most certainly fry the tweeters. There is a step-by-step guide floating around in the Net for converting Keilidhs to aktiv, just follow the directions in reverse order.

Depending on circumstances however, I personally would not bother reworking the Keilidhs because they are a bit of a hassle to get inside - but what's more important, they lose a lot of their personality when run in passive mode. Besides, LK140s are not too difficult to source.

 
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Pennypacker

d^_^b
Wammer
Oct 10, 2018
612
384
83
Netherlands
HiFi Trade?
  1. Yes
  2. No
I would buy an LK85 of LK140 or even better an AV5125/D the LK are “cheapish” and reconversion of Keilidh’s a hassle plus it includes soldering.. 

 
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heimo

Naimless
Wammer
Sep 14, 2020
53
44
23
Vienna, Austria EU
AKA
Heimo
HiFi Trade?
  1. No
I would buy an LK85 of LK140 or even better an AV5125/D the LK are “cheapish” and reconversion of Keilidh’s a hassle plus it includes soldering.. 
When I first aktivated my Keilidhs, I used a combination of LK85 and LK140. It did not sound "right" at all and I quickly bought a second LK140. It might however be reasonable and sonically rewarding to grab a 5125 and sell off the remaining LK140.

 
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Dasher

Wammer
Wammer
Jun 7, 2019
824
830
98
HiFi Trade?
  1. No
I would buy an LK85 of LK140 or even better an AV5125/D the LK are “cheapish” and reconversion of Keilidh’s a hassle plus it includes soldering..
I agree with both this and Heimo's comment. Taking Keilidhs back to passive is a pain. It was bad enough accessing the cards to go active in the first place and going back inside to re-solder (make up) the links wouldn't fill me with joy. Besides, Keilidhs are so much better when active. I also agree with Heimo, whilst an LK85 can be paired with a 140 - and I've been there too - a pair of 140s is the better than mixing the models. I went from 3 x LK140 to using six channels of AV5125 and I preferred the AV5125s (I still have them (3) - powering Espeks, Ekwal and Katans active). One AV 5125 would probably be my choice - especially if I could find one with Dynamik PS. All this assumes that the bass card isn't fried - but as has been said, LK 140s are relatively common on the used markets and usually very robust.
 
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maarty

Newbie
Wammer
Nov 27, 2020
8
5
23
That's the easy part, though. You then need to convert the Keilidhs' built-in crossovers back to passive, otherwise you will most certainly fry the tweeters. There is a step-by-step guide floating around in the Net for converting Keilidhs to aktiv, just follow the directions in reverse order.

Depending on circumstances however, I personally would not bother reworking the Keilidhs because they are a bit of a hassle to get inside - but what's more important, they lose a lot of their personality when run in passive mode. Besides, LK140s are not too difficult to source.
I found the wiring / soldering Keilidhs to and from Aktive / Passive a pain but it's probably easy for those more accomplished with a soldering iron.